python-mitm.py

#! /usr/bin/env python3

import select
import socket
import time

TIME_WAIT = 0.01
BIND_ADDR = ''
BIND_PORT = 8443
SERV_ADDR = 'server.example.com'
SERV_PORT = 8443

def Route():
    listener = socket.socket()
    listener.bind((BIND_ADDR, BIND_PORT))
    listener.listen(1)

    client, caddr = listener.accept()
    listener.close()

    server = sock.socket()
    server.connect((SERV_ADDR, SERV_PORT))
    running = True

    while running:
        try:
            rlist = select.select([client, server], [], [])[0]

            if client in rlist:
                buf = client.recv(4096)
                if len(buf) == 0:
                    running = False

                # Parse, modify, or halt traffic here

                server.send(buf)

            if server in rlist and running:
                buf = server.recv(4096)
                if len(buf) == 0:
                    running = False

                # Parse, modify, or halt traffic here

                client.send(buf)

    except:
        pass

    try:
        client.close()
    except:
        pass

    try:
        server.close()
    except:
        pass
            
if __name__ == '__main__':
    Route()